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The three holes have 1/4"-28 threads in the top with 1/8" holes for 1/8" O.D. PTFE tubing. The body is glass filled PTFE. PET screw cap has a GL-45 thread. The cap includes three 1/4"-28 ETFE plugs and a Viton® o-ring for sealing to the reservoir. Integral pressure relief valve relieves reservoir pressure at 10 psi.